WIP: fix: Skip image-repository validation for ECR images (#2934)

[alexisfacques]

Which issue(s) does this change fix?

Issue #2934

Why is this change necessary?

• Fix/Resolve the image_repository_validation for Docker-packaged lambda functions with valid ECR locations (Issue Skip Docker Lambda image builds when ImageUri is a valid ECR location #2934, introduced in PR fix: Skip build of Docker image if ImageUri is a valid ECR URL (#2934) #2935);
• Remove Docker-packaged lambda functions with valid ECR locations from the --guided guided context prompts.

How does it address the issue?

• Instead of resolving packageable Image functions from the raw template file(s) (get_template_function_resource_ids, get_template_artifacts_format), use the SamFunctionProvider to do so.

What side effects does this change have?

• image_repository_validation occurs later on in the deploy process (requires the CLI context);
• Renders get_template_function_resource_ids, get_template_artifacts_format obsolete (not yet deleted from the repo);
• Reworked the SamFunctionProvider recent changes to make the resource selection a little bit more straightforward.

Checklist

• Add input/output type hints to new functions/methods
• Write design document (Do I need to write a design document?)
• Write unit tests
• Write/update functional tests
• Write/update integration tests
• make pr passes
• make update-reproducible-reqs if dependencies were changed
• Write documentation

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.